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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b138136360efe30e985c231de155f33c678c3eee487e3c9a2ea5ec8c441818a9' 
  AND token = '0uqFV5UVDtd9Y9gbsa8O4XJCnVDalHpbCyXd7PFl1aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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