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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6972cf8ba5dc455705181551a672dac88b651976d4d29c04c366d0c2b21dc8d' 
  AND token = 'uXz0fcB/soZ4TH59kFqfCXzM7SyOx90/wPUCDcXI3io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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