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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0fe0dcebd8259278279be766c795a3c1904a75cfaed2300368ec72d8c7d22c9' 
  AND token = '3R5ccZZMABHJlNnMygQRbFs90h0iQoMfJ8/JIgvIbVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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