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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307be0e0b6335891d32f6076248316e85328ecc8b8b2e591a1e9bebdc084dd86' 
  AND token = 'zg5jP5JgJUC9nXH5S6Qd5SGZf2wvi40HfONKWSrOX0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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