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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc449758da60e0e2981f16704a015b4359948e58f2aa046e4cf005ae5f6ad55' 
  AND token = 'LGnaaeyorn3LOWtD/gyQN4xQUgYQ535EyGNTVmthh/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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