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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a204952db39b75531d91bad2d0201cb32e691a2d566b00871cab5b01d20d2ef' 
  AND token = 'afu0BAWJhbI/8sW1HOAmgDrngTVNp3Y06u9O4vtLUvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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