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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da6a8e985e5fc51490f48b57d2601f5773e026c32939540a63692166b1ea34f' 
  AND token = 'SscJVUpdc4WCK79EuRDLeo6e9iI3qdv4ndM+qDVVURc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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