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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f442e0569e9905a88ef2ba6e107c453b183bee07e1d166cc58badfe2a67a2f4e' 
  AND token = 'rGWgy3XcKrp94mqAACXM5OU7kDmLlkTuOAi7ufbhFX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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