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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4972691227a655e00f739a81b67c0409885e5ad5017086ecaff2c5230011269' 
  AND token = 'bi8+KsmKwfSlvcnaR1OMHDfJsF9QqX96XkjXOQ7hafI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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