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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6f0dbedfa57b6924f80e8fd8144e0339cab22bb87d19f899dff9c8a3ded143' 
  AND token = 'hAOBblm5jAu5H0RxSRqFTelnpGnC6bH0j2+jQFgHfoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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