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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97dcabfb35f3a3df5c581a8453d701306bbbaea04b359df012d5104abd6bdfbb' 
  AND token = 'uCdT09dS96twqnEYJ2tY0+XDy60AwFlQZIC9/CBVj/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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