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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1c00c964f2babe258c3c18dae4d8562726de1ec1bb83c4fc9ee894705e8496' 
  AND token = 'VUQi3Fs/vbxEzG4RkERT6KPak2tqWrBQ6DOoYkEPu6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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