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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9900d353e28a58685982cea6b21fd40c00adca92a7e05561f4f6883995f717b8' 
  AND token = '/dgNI8fZqg787aMpV49dA6FlZez/7kf0zzGgNfiCyl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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