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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f510c77cc9ae79d7c6911fc9e3bd25248069254b4d54131339ab1e4d15f5051' 
  AND token = 'ntPNOH3/eX7CNr1Kn5EtZvNhlyU34SuDnMH5wMApFt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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