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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeebbe90c505dae2de1368fdd5ff73bd09182433c8021d94eee7470c213fddb2' 
  AND token = 'BulQ6p4U36zRqlr2nATlSxmBzjDgUxcK6WgDuBzB2m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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