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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eafe6bbd929ac96750d3b58bf323e45b5c1b7dfdd5082736a3415aaa16700e4' 
  AND token = 'sjXZ/XYOYQ9QabNDshubOgWcr5jq1taYXZxjIviOLr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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