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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd503e82654549fb09601cdf6c2f19764cb9101fc0699b6827b65c98f78a35fa7' 
  AND token = 'YFNSV3DCU/0NQdQTdEf8KLBbNzLJ2Vs0K1Q34zPkEcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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