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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91dc9ca6114804c4021f15448ccd459e92210d0ed4e1a9228530a876100da1b3' 
  AND token = 'v150aNOC2lWxxVpk+C3D8w036J8ERad5My0nVGXz7nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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