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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fd1eb72000d0e0c1d04d4b96ffc52ede2a5ae7060c14767d3856e339fe96ea' 
  AND token = '57WtLLgbwuy/qJ64GjOLtIEjhr9DalicUoxG+7H1dyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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