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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e82644821ff6d4d7dfed2c095e9cf15be7187946976898860450d5bb5a046ed' 
  AND token = 'fxTgSgxLUVmIr3Nj6/OCIHyznZRM8Ji7yCmf8wFJXyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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