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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e6e6de27a407d66fbc68b27430467ddf062ac45d8a7d43a3d6f78000374291' 
  AND token = 'uamI4ZlYQImryyO4zHQX1MSSnHdp6vosfWuaX6+WOXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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