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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab349baf82611cf08ad614793209a26dc00cebfc61837da610231b9e354221e' 
  AND token = '0LJ4poI6xnX1M+uUK014hpwdKHUx4gyelth/XW8I8F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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