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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfc3aa6b3994dbf5ade26a42c05badd12795e6c2a4b06e55ff6ca47f3d1c634' 
  AND token = 'sQN+QAlgmxL7Uzj9+HmgvZohEagVe5mlm2pfc6zFKqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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