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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c5743f90e7dd5db9ee195d7b148e3c6011e0c711c3885552e80a50440a16f9' 
  AND token = 'p5m++1qFEwquzLpL5ulBc/l9FtJHvH1+P/r2du72b18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}