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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59baa2cdcb1e122a5e79a47ecb4f9cf2d1cea460f037ba088126bed597a1789f' 
  AND token = '7pFdNJuW9iWnFsobF370B3G1wn7e4kpyChyOD+1A+Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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