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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964cdaab565fb90a8cdef27f4d5047e9bb24ee49991440fe34a80e36d04449a9' 
  AND token = 'AoQi8aKJtp0BTRIlsNTWlQ/89o03Szby33h2XMkJzuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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