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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77336a54212498f142644e9e118e17362441776d7cb885fc3c6d2dca1bdd436' 
  AND token = 'NjwOp7ztXPok5H0n+ZYqRC5yNlWUh42yvdO7O5ms7Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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