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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51eba37d366d4986df5a225a302d6ff3c58d77d872cbaf7d4ae08c4f81e84d2e' 
  AND token = 'bI1yOO6aoyPPld94ahsTb+xJ/ukotv5s27MuvFndfeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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