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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e07f2a6ab45c3e9e52bab80198bb1cf9f4dcada95a774b6ea08e6e64cf3fa67' 
  AND token = 'HkC3sryWNei4lorYWf3bQqFKR2EWcy0GKolupeZxls4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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