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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c358af8fae1d6639b2590ed498a05b9ae9a2335cb4af051ccf4b8ca15ba5834' 
  AND token = 'AAAZTN8Y9GXOBxe0E1N/uF/JGdeXNtW2PxqqURatzsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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