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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a642aeb5920bcf0f98a865bd371468af2ed6da389e1b1395987abfa2981738' 
  AND token = 'zIiDKBMtoU2w5pa7J9zRC23mNG/NHMvtIovvE9h5qNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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