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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c75ac08645ceb7cc61921c8df3fceaf8800e2c1fc355861058ccc88fe38ad2' 
  AND token = 'BlfWr4gZPcKj4p3QHPl4OUz3dz31qi1UFaA+rGdGRa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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