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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4b75dd162c721f02841f8567a8d977b22c69f967a49e979d9ffb7b4134c3ad' 
  AND token = 'd1n7fd6du8tx5/GsTm5KMGGo4sRV+P9zJGi4//IrAaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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