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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd6baf5a94e5b26fd849da4b26c77c5c028bb15b45521b9fddfd8ab4aef7e3d' 
  AND token = 'c18Avp34Do5jRJejswNjWTfOONTBgLDP5KkyP5GymIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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