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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c802ceb594f167147cdb82e4bb02fc027bdb7a8cb4488355e0d44581102f937' 
  AND token = 'BIVDtHay9mCWJez29mh+JADe0yCflz0Z+4AXcPcVKNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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