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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cacbae05f46b9dc93ab26cee17c4d29e3544c20d5df0c0d0ca9b8e243476fa' 
  AND token = '5UN/RnBmE3z+qZx9ePGTtq/e236N4cYsAceip3r1Lmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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