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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5daf80b9187386b4a68a12d201191b4830961d616876cc6eec60abc65636e21a' 
  AND token = 'Lr9ZZA90gsAykgYX9KN+9U2pYwwiX5SzzFIP+FeDipg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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