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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5812702c047c328ec1e8a3a9261ce1c1153a2755aad2b02032110664de948b6a' 
  AND token = 'tSC3k7o7N6gTbJdSGHazNLNTTmFqjoZvZT1pr5VTsu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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