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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c18e8f980983be28b460640c8dede6d02c2bc1652d12cd3613f99c3d0ad82a4' 
  AND token = 'Gtx/8bdxFjburfn656N4byzba14h5xj7b0AgAkocu4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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