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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cf3114fbc1362765b7a0463324fe831e7b2938c4b25ad3278618994384415c' 
  AND token = 'NnX8/8ag0PKaDg28uCgP25W6bdhEdByZ6g8X5TNgw0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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