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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7d7dbac8e2820ff541ce07097cf8f26de7b86b40ae8fdad9afb30cf1f19c47' 
  AND token = '/0fGZElMrc/KA++T75RZlKcaKY/ALAkdVRGts6GipKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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