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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978cfe10c205f9b000886053622641b142899ed050d95707066b7c4c3e0c63c8' 
  AND token = 'lqWZdr5MpQgY/cO4aLThwuPybRnjmb/z4uSpvLUm0AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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