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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e2e2870f7bee03c98dff375a6f157b832b7ff3527d03b527d538edda6e1e93' 
  AND token = 'Lrp80SLzRhE9D9awovgWlUmEG/yXQbELtx1LkTmFDNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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