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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ad04adab4890f23d884949fca72e0f9279b5a3bbef057ca7e5afa0a1f6cf0e' 
  AND token = '7xPyQtqkW68q+i5wwR4xgs3LQKlXnRvjetpECSFrAF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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