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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e991424ac5fe6f2c94d092cdee69eb4f9c257fb4bd770b30d90a70f519453ae3' 
  AND token = 'ZTjPaUkDgcmrqIYVTpoPi+urt4FKQikm+rU1N8qIX4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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