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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bb20f706474eb4401a7a77b3e041fc76038b0f3e62e9b8b7197bf8c1097d66' 
  AND token = 'hYoJtXhVck10v4B1Fy+uBpQeDrfmhiWnluBXFzmU5J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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