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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e31cb636f2e4e1f69268b2024725dcae986443fabb8df1acb1d987bb3b682a2' 
  AND token = '5gfLOKY2DwET6tTbvL2qnFsBjMC0x3nTEEGKSJmx3WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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