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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b883a020ae99d35c6594b26d072a00975dc1880501548b9d498457cd907a82' 
  AND token = '0RbfD2o3lNTsMntF0FVoj+ouGB83N2smwRXNiQfEDJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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