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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc28a665191b93fe1c7788d41e1c64d888df4c4c1106a9be70b067c1fbea02a4' 
  AND token = 'gNkPZZhbEO7jNK4Lf4eDb9OE7JWq7NxUn1WVwBIzBB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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