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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0120ef5d2f9c3dada0f9e24a7986032d7fd2fe247149bdf7168cdf3d30ab19c4' 
  AND token = '8JljK6f6dGIHq9nZg9bxXI1LLPdkZLgISbgXLSGFuNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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