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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53cb6a73132de38c2e5426770f11190c2ef678d75e6b7d94d34d3ca2198da97' 
  AND token = 'um539jAqzyhXyiCp2oi2H4Ra4zBMEdq059jLvmx8nvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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