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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dd27fdc13dac5146c66b6626c0a2b897acbefdaf637ee1fac79f31e617738a' 
  AND token = '6dXu0Xa9qQMRbAw2UMPp1HtY1ifBbrKUcrIe4dS1/tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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