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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62a38f84e7936e1be1151a49ff004b52b8b35ed765c86521c0d64ff62ff90f6' 
  AND token = 't3g9oxcCiRPj9CM6bhmZBScsDG5OEys3dUCkiJgVqxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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