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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51002f087ad582ab75b9419488a09d092940f0d8bb01b0d3bc192f869ca6658b' 
  AND token = '3ThH1YTlK8oH7dR5nbs5E04DomXonHNyijz31sdjlcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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