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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbdb9e3d42a4f557e1bb992a1873b22adaa9d1fc72f775e2cd62e49f68b5de8' 
  AND token = '6TNPB5X55FHEv/N4UiptfeD74y1O2OtAClZfq880Q+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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