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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe11412c722b70795b21af8d941ee08bd37abaa3e0a94c93bd94429f3b950a2' 
  AND token = 'l8+EVVGlmxDG+NeodxDBFUX3n9S34PJGZq6JvKu4NEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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