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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7569044a498ea8edbd562baaf6fb9929ade9239c9068dc0ae61958c7b8fd66' 
  AND token = 'CuHH/Jc6RZuKZesm9Rx56K0BmRnb2k5BBJgePFP+U5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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