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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a2b3271d6618fb44b69a68be6f2f7accc19829bd7d1ed368a195078040aba0' 
  AND token = '3jpDLjmAkSiES/umb3KTZ554s9AO4jyxznwbn4Aosq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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