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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813770eef9b18414a1596fd20320e4c1cd62e2fd8a7168e29431fd42070e51e5' 
  AND token = 'lRRKyWOKuJv+j6iyNA+Jjh0Ci7OXXd6/cT68Z0fZrSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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