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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920c9173ff26acf206d6dbdd5e642b01b5c01cfe207fc476fbc0aa3c62324e90' 
  AND token = 'W9W++eyli42U3wzVWtR0Sn343kiR1dPHXO13pJwDqPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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