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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39835304ee271493fe641814be8e30cf51f6acb5ae9616eadf0041cf8656dbf' 
  AND token = 'ojb5oyyxL4UG6366Vta1bVLYgt5Mf5Q4lNV7FMKJZoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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