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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ebb9eaf2cb7b61e4a588de09cf449bb50752f76c9e2efa022d16c8c439f2b2' 
  AND token = 'VehcfWNplDmo2Ox9JYbS4H2i02m/thKEgVHjkBOiOYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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